drivers/gpu/drm/nouveau/nouveau_ttm.c - linux/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0 OR MIT
 /*
  * Copyright (c) 2007-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA,
  * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA,
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sub license,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice (including the
  * next paragraph) shall be included in all copies or substantial portions
  * of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  */

 #include <linux/limits.h>
 #include <linux/swiotlb.h>

 #include <drm/ttm/ttm_range_manager.h>

 #include "nouveau_drv.h"
 #include "nouveau_gem.h"
 #include "nouveau_mem.h"
 #include "nouveau_ttm.h"

 #include <core/tegra.h>

 static void
 nouveau_manager_del(struct ttm_resource_manager *man, struct ttm_resource *reg)
 {
 	nouveau_mem_del(reg);
 }

 static int
 nouveau_vram_manager_new(struct ttm_resource_manager *man,
 			 struct ttm_buffer_object *bo,
 			 const struct ttm_place *place,
 			 struct ttm_resource **res)
 {
 	struct nouveau_bo *nvbo = nouveau_bo(bo);
 	struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
 	int ret;

 	if (drm->client.device.info.ram_size == 0)
 		return -ENOMEM;

 	ret = nouveau_mem_new(&drm->master, nvbo->kind, nvbo->comp, res);
 	if (ret)
 		return ret;

 	ttm_resource_init(bo, place, *res);

 	ret = nouveau_mem_vram(*res, nvbo->contig, nvbo->page);
 	if (ret) {
 		nouveau_mem_del(*res);
 		return ret;
 	}

 	return 0;
 }

 const struct ttm_resource_manager_func nouveau_vram_manager = {
 	.alloc = nouveau_vram_manager_new,
 	.free = nouveau_manager_del,
 };

 static int
 nouveau_gart_manager_new(struct ttm_resource_manager *man,
 			 struct ttm_buffer_object *bo,
 			 const struct ttm_place *place,
 			 struct ttm_resource **res)
 {
 	struct nouveau_bo *nvbo = nouveau_bo(bo);
 	struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
 	int ret;

 	ret = nouveau_mem_new(&drm->master, nvbo->kind, nvbo->comp, res);
 	if (ret)
 		return ret;

 	ttm_resource_init(bo, place, *res);
 	(*res)->start = 0;
 	return 0;
 }

 const struct ttm_resource_manager_func nouveau_gart_manager = {
 	.alloc = nouveau_gart_manager_new,
 	.free = nouveau_manager_del,
 };

 static int
 nv04_gart_manager_new(struct ttm_resource_manager *man,
 		      struct ttm_buffer_object *bo,
 		      const struct ttm_place *place,
 		      struct ttm_resource **res)
 {
 	struct nouveau_bo *nvbo = nouveau_bo(bo);
 	struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
 	struct nouveau_mem *mem;
 	int ret;

 	ret = nouveau_mem_new(&drm->master, nvbo->kind, nvbo->comp, res);
 	if (ret)
 		return ret;

 	mem = nouveau_mem(*res);
 	ttm_resource_init(bo, place, *res);
 	ret = nvif_vmm_get(&mem->cli->vmm.vmm, PTES, false, 12, 0,
 			   (long)(*res)->num_pages << PAGE_SHIFT, &mem->vma[0]);
 	if (ret) {
 		nouveau_mem_del(*res);
 		return ret;
 	}

 	(*res)->start = mem->vma[0].addr >> PAGE_SHIFT;
 	return 0;
 }

 const struct ttm_resource_manager_func nv04_gart_manager = {
 	.alloc = nv04_gart_manager_new,
 	.free = nouveau_manager_del,
 };

 static int
 nouveau_ttm_init_host(struct nouveau_drm *drm, u8 kind)
 {
 	struct nvif_mmu *mmu = &drm->client.mmu;
 	int typei;

 	typei = nvif_mmu_type(mmu, NVIF_MEM_HOST | NVIF_MEM_MAPPABLE |
 					    kind | NVIF_MEM_COHERENT);
 	if (typei < 0)
 		return -ENOSYS;

 	drm->ttm.type_host[!!kind] = typei;

 	typei = nvif_mmu_type(mmu, NVIF_MEM_HOST | NVIF_MEM_MAPPABLE | kind);
 	if (typei < 0)
 		return -ENOSYS;

 	drm->ttm.type_ncoh[!!kind] = typei;
 	return 0;
 }

 static int
 nouveau_ttm_init_vram(struct nouveau_drm *drm)
 {
 	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA) {
 		struct ttm_resource_manager *man = kzalloc(sizeof(*man), GFP_KERNEL);

 		if (!man)
 			return -ENOMEM;

 		man->func = &nouveau_vram_manager;

 		ttm_resource_manager_init(man,
 					  drm->gem.vram_available >> PAGE_SHIFT);
 		ttm_set_driver_manager(&drm->ttm.bdev, TTM_PL_VRAM, man);
 		ttm_resource_manager_set_used(man, true);
 		return 0;
 	} else {
 		return ttm_range_man_init(&drm->ttm.bdev, TTM_PL_VRAM, false,
 					  drm->gem.vram_available >> PAGE_SHIFT);
 	}
 }

 static void
 nouveau_ttm_fini_vram(struct nouveau_drm *drm)
 {
 	struct ttm_resource_manager *man = ttm_manager_type(&drm->ttm.bdev, TTM_PL_VRAM);

 	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA) {
 		ttm_resource_manager_set_used(man, false);
 		ttm_resource_manager_evict_all(&drm->ttm.bdev, man);
 		ttm_resource_manager_cleanup(man);
 		ttm_set_driver_manager(&drm->ttm.bdev, TTM_PL_VRAM, NULL);
 		kfree(man);
 	} else
 		ttm_range_man_fini(&drm->ttm.bdev, TTM_PL_VRAM);
 }

 static int
 nouveau_ttm_init_gtt(struct nouveau_drm *drm)
 {
 	struct ttm_resource_manager *man;
 	unsigned long size_pages = drm->gem.gart_available >> PAGE_SHIFT;
 	const struct ttm_resource_manager_func *func = NULL;

 	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA)
 		func = &nouveau_gart_manager;
 	else if (!drm->agp.bridge)
 		func = &nv04_gart_manager;
 	else
 		return ttm_range_man_init(&drm->ttm.bdev, TTM_PL_TT, true,
 					  size_pages);

 	man = kzalloc(sizeof(*man), GFP_KERNEL);
 	if (!man)
 		return -ENOMEM;

 	man->func = func;
 	man->use_tt = true;
 	ttm_resource_manager_init(man, size_pages);
 	ttm_set_driver_manager(&drm->ttm.bdev, TTM_PL_TT, man);
 	ttm_resource_manager_set_used(man, true);
 	return 0;
 }

 static void
 nouveau_ttm_fini_gtt(struct nouveau_drm *drm)
 {
 	struct ttm_resource_manager *man = ttm_manager_type(&drm->ttm.bdev, TTM_PL_TT);

 	if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA &&
 	    drm->agp.bridge)
 		ttm_range_man_fini(&drm->ttm.bdev, TTM_PL_TT);
 	else {
 		ttm_resource_manager_set_used(man, false);
 		ttm_resource_manager_evict_all(&drm->ttm.bdev, man);
 		ttm_resource_manager_cleanup(man);
 		ttm_set_driver_manager(&drm->ttm.bdev, TTM_PL_TT, NULL);
 		kfree(man);
 	}
 }

 int
 nouveau_ttm_init(struct nouveau_drm *drm)
 {
 	struct nvkm_device *device = nvxx_device(&drm->client.device);
 	struct nvkm_pci *pci = device->pci;
 	struct nvif_mmu *mmu = &drm->client.mmu;
 	struct drm_device *dev = drm->dev;
 	bool need_swiotlb = false;
 	int typei, ret;

 	ret = nouveau_ttm_init_host(drm, 0);
 	if (ret)
 		return ret;

 	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA &&
 	    drm->client.device.info.chipset != 0x50) {
 		ret = nouveau_ttm_init_host(drm, NVIF_MEM_KIND);
 		if (ret)
 			return ret;
 	}

 	if (drm->client.device.info.platform != NV_DEVICE_INFO_V0_SOC &&
 	    drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA) {
 		typei = nvif_mmu_type(mmu, NVIF_MEM_VRAM | NVIF_MEM_MAPPABLE |
 					   NVIF_MEM_KIND |
 					   NVIF_MEM_COMP |
 					   NVIF_MEM_DISP);
 		if (typei < 0)
 			return -ENOSYS;

 		drm->ttm.type_vram = typei;
 	} else {
 		drm->ttm.type_vram = -1;
 	}

 	if (pci && pci->agp.bridge) {
 		drm->agp.bridge = pci->agp.bridge;
 		drm->agp.base = pci->agp.base;
 		drm->agp.size = pci->agp.size;
 		drm->agp.cma = pci->agp.cma;
 	}

 #if IS_ENABLED(CONFIG_SWIOTLB) && IS_ENABLED(CONFIG_X86)
 	need_swiotlb = is_swiotlb_active();
 #endif

 	ret = ttm_device_init(&drm->ttm.bdev, &nouveau_bo_driver, drm->dev->dev,
 				  dev->anon_inode->i_mapping,
 				  dev->vma_offset_manager, need_swiotlb,
 				  drm->client.mmu.dmabits <= 32);
 	if (ret) {
 		NV_ERROR(drm, "error initialising bo driver, %d\n", ret);
 		return ret;
 	}

 	/* VRAM init */
 	drm->gem.vram_available = drm->client.device.info.ram_user;

 	arch_io_reserve_memtype_wc(device->func->resource_addr(device, 1),
 				   device->func->resource_size(device, 1));

 	ret = nouveau_ttm_init_vram(drm);
 	if (ret) {
 		NV_ERROR(drm, "VRAM mm init failed, %d\n", ret);
 		return ret;
 	}

 	drm->ttm.mtrr = arch_phys_wc_add(device->func->resource_addr(device, 1),
 					 device->func->resource_size(device, 1));

 	/* GART init */
 	if (!drm->agp.bridge) {
 		drm->gem.gart_available = drm->client.vmm.vmm.limit;
 	} else {
 		drm->gem.gart_available = drm->agp.size;
 	}

 	ret = nouveau_ttm_init_gtt(drm);
 	if (ret) {
 		NV_ERROR(drm, "GART mm init failed, %d\n", ret);
 		return ret;
 	}

 	mutex_init(&drm->ttm.io_reserve_mutex);
 	INIT_LIST_HEAD(&drm->ttm.io_reserve_lru);

 	NV_INFO(drm, "VRAM: %d MiB\n", (u32)(drm->gem.vram_available >> 20));
 	NV_INFO(drm, "GART: %d MiB\n", (u32)(drm->gem.gart_available >> 20));
 	return 0;
 }

 void
 nouveau_ttm_fini(struct nouveau_drm *drm)
 {
 	struct nvkm_device *device = nvxx_device(&drm->client.device);

 	nouveau_ttm_fini_vram(drm);
 	nouveau_ttm_fini_gtt(drm);

 	ttm_device_fini(&drm->ttm.bdev);

 	arch_phys_wc_del(drm->ttm.mtrr);
 	drm->ttm.mtrr = 0;
 	arch_io_free_memtype_wc(device->func->resource_addr(device, 1),
 				device->func->resource_size(device, 1));

 }
	// SPDX-License-Identifier: GPL-2.0 OR MIT
	/*
	* Copyright (c) 2007-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA,
	* Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA,
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sub license,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice (including the
	* next paragraph) shall be included in all copies or substantial portions
	* of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	*/

	#include <linux/limits.h>
	#include <linux/swiotlb.h>

	#include <drm/ttm/ttm_range_manager.h>

	#include "nouveau_drv.h"
	#include "nouveau_gem.h"
	#include "nouveau_mem.h"
	#include "nouveau_ttm.h"

	#include <core/tegra.h>

	static void
	nouveau_manager_del(struct ttm_resource_manager man, struct ttm_resource reg)
	{
	nouveau_mem_del(reg);
	}

	static int
	nouveau_vram_manager_new(struct ttm_resource_manager *man,
	struct ttm_buffer_object *bo,
	const struct ttm_place *place,
	struct ttm_resource **res)
	{
	struct nouveau_bo *nvbo = nouveau_bo(bo);
	struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
	int ret;

	if (drm->client.device.info.ram_size == 0)
	return -ENOMEM;

	ret = nouveau_mem_new(&drm->master, nvbo->kind, nvbo->comp, res);
	if (ret)
	return ret;

	ttm_resource_init(bo, place, *res);

	ret = nouveau_mem_vram(*res, nvbo->contig, nvbo->page);
	if (ret) {
	nouveau_mem_del(*res);
	return ret;
	}

	return 0;
	}

	const struct ttm_resource_manager_func nouveau_vram_manager = {
	.alloc = nouveau_vram_manager_new,
	.free = nouveau_manager_del,
	};

	static int
	nouveau_gart_manager_new(struct ttm_resource_manager *man,
	struct ttm_buffer_object *bo,
	const struct ttm_place *place,
	struct ttm_resource **res)
	{
	struct nouveau_bo *nvbo = nouveau_bo(bo);
	struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
	int ret;

	ret = nouveau_mem_new(&drm->master, nvbo->kind, nvbo->comp, res);
	if (ret)
	return ret;

	ttm_resource_init(bo, place, *res);
	(*res)->start = 0;
	return 0;
	}

	const struct ttm_resource_manager_func nouveau_gart_manager = {
	.alloc = nouveau_gart_manager_new,
	.free = nouveau_manager_del,
	};

	static int
	nv04_gart_manager_new(struct ttm_resource_manager *man,
	struct ttm_buffer_object *bo,
	const struct ttm_place *place,
	struct ttm_resource **res)
	{
	struct nouveau_bo *nvbo = nouveau_bo(bo);
	struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
	struct nouveau_mem *mem;
	int ret;

	ret = nouveau_mem_new(&drm->master, nvbo->kind, nvbo->comp, res);
	if (ret)
	return ret;

	mem = nouveau_mem(*res);
	ttm_resource_init(bo, place, *res);
	ret = nvif_vmm_get(&mem->cli->vmm.vmm, PTES, false, 12, 0,
	(long)(*res)->num_pages << PAGE_SHIFT, &mem->vma[0]);
	if (ret) {
	nouveau_mem_del(*res);
	return ret;
	}

	(*res)->start = mem->vma[0].addr >> PAGE_SHIFT;
	return 0;
	}

	const struct ttm_resource_manager_func nv04_gart_manager = {
	.alloc = nv04_gart_manager_new,
	.free = nouveau_manager_del,
	};

	static int
	nouveau_ttm_init_host(struct nouveau_drm *drm, u8 kind)
	{
	struct nvif_mmu *mmu = &drm->client.mmu;
	int typei;

	typei = nvif_mmu_type(mmu, NVIF_MEM_HOST \| NVIF_MEM_MAPPABLE \|
	kind \| NVIF_MEM_COHERENT);
	if (typei < 0)
	return -ENOSYS;

	drm->ttm.type_host[!!kind] = typei;

	typei = nvif_mmu_type(mmu, NVIF_MEM_HOST \| NVIF_MEM_MAPPABLE \| kind);
	if (typei < 0)
	return -ENOSYS;

	drm->ttm.type_ncoh[!!kind] = typei;
	return 0;
	}

	static int
	nouveau_ttm_init_vram(struct nouveau_drm *drm)
	{
	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA) {
	struct ttm_resource_manager man = kzalloc(sizeof(man), GFP_KERNEL);

	if (!man)
	return -ENOMEM;

	man->func = &nouveau_vram_manager;

	ttm_resource_manager_init(man,
	drm->gem.vram_available >> PAGE_SHIFT);
	ttm_set_driver_manager(&drm->ttm.bdev, TTM_PL_VRAM, man);
	ttm_resource_manager_set_used(man, true);
	return 0;
	} else {
	return ttm_range_man_init(&drm->ttm.bdev, TTM_PL_VRAM, false,
	drm->gem.vram_available >> PAGE_SHIFT);
	}
	}

	static void
	nouveau_ttm_fini_vram(struct nouveau_drm *drm)
	{
	struct ttm_resource_manager *man = ttm_manager_type(&drm->ttm.bdev, TTM_PL_VRAM);

	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA) {
	ttm_resource_manager_set_used(man, false);
	ttm_resource_manager_evict_all(&drm->ttm.bdev, man);
	ttm_resource_manager_cleanup(man);
	ttm_set_driver_manager(&drm->ttm.bdev, TTM_PL_VRAM, NULL);
	kfree(man);
	} else
	ttm_range_man_fini(&drm->ttm.bdev, TTM_PL_VRAM);
	}

	static int
	nouveau_ttm_init_gtt(struct nouveau_drm *drm)
	{
	struct ttm_resource_manager *man;
	unsigned long size_pages = drm->gem.gart_available >> PAGE_SHIFT;
	const struct ttm_resource_manager_func *func = NULL;

	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA)
	func = &nouveau_gart_manager;
	else if (!drm->agp.bridge)
	func = &nv04_gart_manager;
	else
	return ttm_range_man_init(&drm->ttm.bdev, TTM_PL_TT, true,
	size_pages);

	man = kzalloc(sizeof(*man), GFP_KERNEL);
	if (!man)
	return -ENOMEM;

	man->func = func;
	man->use_tt = true;
	ttm_resource_manager_init(man, size_pages);
	ttm_set_driver_manager(&drm->ttm.bdev, TTM_PL_TT, man);
	ttm_resource_manager_set_used(man, true);
	return 0;
	}

	static void
	nouveau_ttm_fini_gtt(struct nouveau_drm *drm)
	{
	struct ttm_resource_manager *man = ttm_manager_type(&drm->ttm.bdev, TTM_PL_TT);

	if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA &&
	drm->agp.bridge)
	ttm_range_man_fini(&drm->ttm.bdev, TTM_PL_TT);
	else {
	ttm_resource_manager_set_used(man, false);
	ttm_resource_manager_evict_all(&drm->ttm.bdev, man);
	ttm_resource_manager_cleanup(man);
	ttm_set_driver_manager(&drm->ttm.bdev, TTM_PL_TT, NULL);
	kfree(man);
	}
	}

	int
	nouveau_ttm_init(struct nouveau_drm *drm)
	{
	struct nvkm_device *device = nvxx_device(&drm->client.device);
	struct nvkm_pci *pci = device->pci;
	struct nvif_mmu *mmu = &drm->client.mmu;
	struct drm_device *dev = drm->dev;
	bool need_swiotlb = false;
	int typei, ret;

	ret = nouveau_ttm_init_host(drm, 0);
	if (ret)
	return ret;

	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA &&
	drm->client.device.info.chipset != 0x50) {
	ret = nouveau_ttm_init_host(drm, NVIF_MEM_KIND);
	if (ret)
	return ret;
	}

	if (drm->client.device.info.platform != NV_DEVICE_INFO_V0_SOC &&
	drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA) {
	typei = nvif_mmu_type(mmu, NVIF_MEM_VRAM \| NVIF_MEM_MAPPABLE \|
	NVIF_MEM_KIND \|
	NVIF_MEM_COMP \|
	NVIF_MEM_DISP);
	if (typei < 0)
	return -ENOSYS;

	drm->ttm.type_vram = typei;
	} else {
	drm->ttm.type_vram = -1;
	}

	if (pci && pci->agp.bridge) {
	drm->agp.bridge = pci->agp.bridge;
	drm->agp.base = pci->agp.base;
	drm->agp.size = pci->agp.size;
	drm->agp.cma = pci->agp.cma;
	}

	#if IS_ENABLED(CONFIG_SWIOTLB) && IS_ENABLED(CONFIG_X86)
	need_swiotlb = is_swiotlb_active();
	#endif

	ret = ttm_device_init(&drm->ttm.bdev, &nouveau_bo_driver, drm->dev->dev,
	dev->anon_inode->i_mapping,
	dev->vma_offset_manager, need_swiotlb,
	drm->client.mmu.dmabits <= 32);
	if (ret) {
	NV_ERROR(drm, "error initialising bo driver, %d\n", ret);
	return ret;
	}

	/* VRAM init */
	drm->gem.vram_available = drm->client.device.info.ram_user;

	arch_io_reserve_memtype_wc(device->func->resource_addr(device, 1),
	device->func->resource_size(device, 1));

	ret = nouveau_ttm_init_vram(drm);
	if (ret) {
	NV_ERROR(drm, "VRAM mm init failed, %d\n", ret);
	return ret;
	}

	drm->ttm.mtrr = arch_phys_wc_add(device->func->resource_addr(device, 1),
	device->func->resource_size(device, 1));

	/* GART init */
	if (!drm->agp.bridge) {
	drm->gem.gart_available = drm->client.vmm.vmm.limit;
	} else {
	drm->gem.gart_available = drm->agp.size;
	}

	ret = nouveau_ttm_init_gtt(drm);
	if (ret) {
	NV_ERROR(drm, "GART mm init failed, %d\n", ret);
	return ret;
	}

	mutex_init(&drm->ttm.io_reserve_mutex);
	INIT_LIST_HEAD(&drm->ttm.io_reserve_lru);

	NV_INFO(drm, "VRAM: %d MiB\n", (u32)(drm->gem.vram_available >> 20));
	NV_INFO(drm, "GART: %d MiB\n", (u32)(drm->gem.gart_available >> 20));
	return 0;
	}

	void
	nouveau_ttm_fini(struct nouveau_drm *drm)
	{
	struct nvkm_device *device = nvxx_device(&drm->client.device);

	nouveau_ttm_fini_vram(drm);
	nouveau_ttm_fini_gtt(drm);

	ttm_device_fini(&drm->ttm.bdev);

	arch_phys_wc_del(drm->ttm.mtrr);
	drm->ttm.mtrr = 0;
	arch_io_free_memtype_wc(device->func->resource_addr(device, 1),
	device->func->resource_size(device, 1));

	}